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How to detect the air pressure of inflatable packaging

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Because the altitude has an impact on the inflatable packaging of food, the amount of inflation in places with high altitude should be smaller. Is there any instrument that can detect the inflation volume of inflatable packaging?

take out the gas in the bag with a syringe and press it into clear lime water

possible observed phenomena and conclusions:
if the clarified lime water becomes turbid, the gas in the packaging bag is carbon dioxide

(2) experimental method and operation:
if the clarified lime water is not turbid, extract the gas in the packaging bag with a needle cylinder, collect it in the gas collecting cylinder with the drainage method, extend the burning wood strip into the gas collecting cylinder and observe the combustion
possible observed phenomena and conclusions:
if the wood strip burns normally, the gas in the packing bag is air; If extinguished, the gas in the bag is nitrogen

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